Furnace front



Oct. 16 1923.

. J. REID FURNACE FRONT Filed June 6. 1921 2 Sheet-Sheet 1 J. REID FURNACE FRONT Oct. 16, 1923.

k Sheets-Sheet 2 Filed June 6, 1921 Him/"nay Toall' whom t-may ncerm 1 Be itknown that I, J OHN REID, aasubject of the King of Great'; Britain and Ireland, residing at London, England, have invented" Patented ()ct..16,1923

: [UNITED .i'oiii nnrn, or LONDON, ENGLA in. ,f

" :FUBNACE FRONT.

Application" filed June I G,

Improvements in Furnace Fronts, ofiwhich the following is a specification. Y

- This invention has reference to furnace fronts, more especiallyiforced draught fur nace' fronts for steam boilers, objects bei g to facilitatethe free and smooth flow of air into the furnace, especially where: centre and wing furnaces'are employed as in boilers of the ScotchmarinetypQ-toenablethe distribution of air to-be'regulated more sat isfactorily to suit varying requirements and to provide simple"constructionsfof furnace fronts suitable forlc'o al burning' but "convertiblefor the purpose of 'oil burning and capable: of having parts inost liableilto be damaged readily repla'ced from stock or're-v moved, repaired and replaced.

QThe furnace front, a's is usual conipi'ises front 'and back, plates with intermediate ashpit flare and ;fuel passage-':'casing,an; air casing over the fuel passagecasmg and a sill under it, the pocket or space between the plates around the air'ca'sin'g being in I communication with theairysupply. Each downwardly extending: side of the air casing is in the is'a nepla ne as the" corra 7 sponding upwardly extending side portion occupied by pivoted valves each ofwhich is 35. common to thefspace betweenthe sill and of theiashpit flare, and the gaps 1 between.

the sideso'f the air .c'asingand theflare are the ashpit' fiare and" tothe space within the air casing around and over the fuel passage casingiand controls the flow of air 'to the said air spaces the lower edges of the sides of the fuel passagecasing are provided with:

curved extensionsfwh'ichserve-to guide or 7. through ports intothe fuel passageT'casing andin'tofthe furnace The common valves are preferably so arranged that, in addition correspondingly "opening the space between deflect air up'the sidesandover'thetop of the. fuel passage casing whence" it passes to serving to regulategthefainounti of air simultaneously flowing tog-the" air'spaces above and below thelsillylevel, they can be set to admit someair'ftothe space'around nd over I the fuel assa e casing, and to regulate} the amount thusadniit'ted, without the sill and the 'ashpit" fiare to the air supply. Furthermore, to enable the amount of airpassingto thesp'ace' around and over the 1921; SerialNo. 475,385. 1 1

r q s Of any particular ease, the

curved air" guiding or deflecting extensions are adapted to be adjustedv vertically in re lationto the openings Tcontrolle'dgbythe plates.

The 'accornpanyingidrawings illustrate by way of example a furnace 'front embodying .iuel passage casingto be varied to suit the 1 valves, whilst",'toj,enable the amountofair flowing through'the ports in the crownof the" fuel {passage casing to beivaried to suit the conditions of oil firing or coal firing," the said ports are adjustable in size by the .insertion or removal offfilling pieces on the present improvements and designed more Fig. 1-being afront elevatiori;

I Figs. 2,- and 3' Vertical'sections at right "especially. to permit of ready conversi n f a burning oil'or coal., I

angles, Fig. 2 being takenon the line'2+2 igs. 4 andzs demn sectional views on the lines GCjandf DjD Fig. 3fland Fig'. 6a

detail jsectionalview hereinafter referred to.

Fig. ,7 .is :a detail view: corresponding to the right. hand side of Fig. f3'illiistrating a modified'arrangement"of valve a R ferring to 'Figs/l to 6', the front'coinprises afront platef'a andQa'back plate I) each formedwith projections which when the two partsare vconnected by the bolts a forni t fuel passagecasin-g-iol is approximatelysemithe usual "firebox ":of approximately rea the flare 0 and the iai casing Shown. lymg the p e d the valves I e ashpit flare 0,thefuel passage casing d and the air casing e thereoverythe i .90-

circular-in section as regards its upper part, 1 which form is more suitable'for'fitting an oil burner and appurtenances" aftermmoval of the fire door z' and the sill *it, than.

1 tangular'sectio-n. "Ve-rtical side portions of v f controlling the spacesb'etween them are] pivoted at f and have their upper portionsloo f bent, outwardly into a1 dififerent'radial plane; each extensions; ofthe flare-0 is i V curved to a radius struck from the corre: f

spending pivot f ythe arrangement being such that the .valves can be shifted'fromthe intermediate position shown in full lines f, and ;in' which position air'is admitted to the" I air" casing only, to either 0f the extreme positions indicated by dotted lines, -ini one of. which positions air will be shutoff from both the; air; casing and the ash 'pit space and in the other position air will be admit the plane offthe vertical casing and flare m The curved-angulding or 'deflegctinge-Xtensions be cast ted to ,hQtll; The same result may be, ob: taineglzwitl iont the use of bent valves, pivoting fiat valves so that, when closed their upper and lower edges abut against the lower'edges of the downwardly extending side portions of the air casing e and the outer portionsof the curved extensions 'c of the flare respectively as shownin Fig. 7. i XVherethe advantage of being able to admit airvto thev a-ir casinge witheiet admittlng air to the ashpit s-net requ red, the

integral with the projections forming the fire box, but preieralol v are s61 7 etc inany convenient mam-lien In one'arra; rnenhas shown. 111' Flg. 6, eachextens n piecemay he'lormed with a vertical lug 6Z adaptedto enter somewhat elonqated islet-s ingtheifaces ofthe'saicl projections and to he fri'ot ona-lly heldin the requiredvertical firing; theinsertion th *us ial get; I V- When'the-dajor 1S 1 vopen, the. ports in are rendered aceessihle tor fitting in the filling positionnwhenthe front 'and back plates of the front are bolted togetheiiy 'c Thecrown of the fuelpassagecasi-ng (Z is formed with ports it having recessed edges towards the'ccbac-l; plate to receive filling :p eees Zzi tFigsee and hen coal filling; l piecesconceittratingjthe ai supplyin front of the 1 The-door .5 mo; in; the front: plate a are of rd rectangular shape 'se that door; ope

'7 pieces But insteadgof the' 'fL-iel passage "p e es. to he; morefeasilv whenlrequired. V v p p v I The drawings illustrate a front arranged for coal firing but .itvwill. be understood that casing (1 being formedby projectienson the;

front ancl'bacl'r'plates as shown it may he 7 of the withdrawal type to enablelthe filling Th 'fip nd esetthe ivalvesf f are pro.

vided withhandleso which constitute means for setting the valves and havejlocking arms Wliicharel adapted-to engage the fco'rre spending eornersof the closed firedoor independently fort-he purpose of preventing it being epened whilst the valves areyset :to admit air to the ashpit space.-

- In some cases tlle topjot the air casing may be formed witha centralport which may be closed by a valve. or removable plate to adapt the fron-t. fervoil burning the fire doeris replaced bya-seitalole closure 9, the required-oil burn' g devices, the is removed ;an d the fil-.ing"-pieces are femoled fmiTMhQ-POWS i t e crown of th firebox. w I

* r aek p sii ter ed te shpi-t fiare'fuel sate there-z and ad-justably c attached t ingov'er a curved extension of the flare,

different radial plane s.

passage casing air casing thereover, a re 7 movable s ll, openings hetweenthei alr ca e-- ing sides and the flare, pivoted valves controlling said openings, each of which valves is -'corrimon to-t'he air space between the sill and the flarefand the air space within the air casing, outwardly turned extensions on the fuel passage casingprojecting towards the valve pivots and means for setting said {valves so as to open air spaces to the air -supply M p v 2.} A 7 furnace front comprising front andback plates, intermediate. ashpit flare, fuel passage casing,- air 'easing thereov r, movable sill, openings between the aircasing vsides and the flare, i pivoted. valves controlling said openings, eachof which valves is common to the air space between thesill" and the flare ,a-ndthe air space within. the a r casing, and" s adapted to be set so, as p th pac wl hmzthe ai as ng to the air supply without correspondingly opening the space between the sill and the flare. o c I 3- A-furn ce ironti ompr si-ne .2 u and back plates,-; intermediate ashpit fia 'e, 1 fuel passage casingfair casing thereover, a removable sill, openings-between the air ;c as- 111g s des and the fiare, 1voted valves eon trolling said openings, each of whichvalvcs 1s common to the airspace-between the sill and the flare and the air space witliin the andtheai Casin the u er part of each valee closing against vrfthe edge of the air casng slde and the lower partof each-valve" o1 5 v urnace trout comprising front and b rk p a e men edla e ashp fl passage casing alr casing thereovejr, va re m ab s pening e een h air ingcsitl-es and the flare;pivetedvalaconr ng a d p n ngsge cl efwl hyv ve is eemrnonto the air space between the sill and the flar and th spa wi h-is the air easing, the upper. part of each valve c o ermi e-M edge at the raeasieg side andthe lower part of each valve mov ing Over a curved x ees on 0f -;flare an each valve havingupper anclilewer in 5, A rn c 11 1 empri s g ront b ck pla interm d ate lSlipii; re, vfeel pa ge c me, 1 ,1 easing thereev r, a re movableysill, openings between the-air easing S e e d h flare, p ot se ve re, fu i 1 back plates, intermediate ashpit flareffuela passage casing, air casing thereover, a removable sill,'openings between the air casing sides and the flare, pivoted valves controlling said openings, each of which valves is common to the air space between the sill andthe flare and the air space within the air casing, the upper part of each valve closing agalnst the edge of the air casing side and the lower part 'of eacli valvemov ing over a curved extension. of the flare, a

fire door for closing the front of the fuel passage casing, means for setting saidvalvese so asto open the said air spaces tothe air supply and means adapted to then interlock each valve'independently with the fire door.

'7. A furnace front comprising frontand back plates, intermecliateashpit flare, fuel passage casing, air casing thereover, re-r, movable sill, openings between the air casing sides and the flare, pivoted valves controlling said openings, each OfWhlCll valves d is common to the air space between thesill and the flare and the air space within the. air casing afire' door for closing the front of the fuel passage casing, an internal baflie attached thereto, airports in the fuel passage casing through which air can pass beto thespace between the sill 'and'the ashpittween the door and bafiie, and means for settingthe valves so as to'allow air topass' to the air casingand throughlsaid ports and flare. I I

8. A- furnace front comprising front and ,1 back plates, intermediate ashpit flare, fuel pas-sage casing, air casing there'over, a, re

- movable sill, openings'between the air casing sides and the flare, piv'oted valves c'ontrolling said openings, each of which valves is common to the airspace betweenthejsillz andtheflare and the air spacewithin the air casing, outwardly turned, extensionson the fuel p assage casing projecting towards the.

valve pivots said extensions being adjustable vertically, and means for'setting. said valves so as to open said air spaces to the air supply. I

,9. A-furnace front' comprising front and V back plates, intermediate ashpit flare,fuel

passage casing, air casing thereover, a" re Imovable sill, openings between the air cas ring sides and the flare, pivoted valves controlling said openings, each of which valves o p is coinmonito the'air space between the sill andthe flareand the air space within the -%air easing, a fire door for closing the front 7 v of thefuel 'passagercasing, an internal baflle attachedthereto,air ports in the fuel pas sage casingthrough which air can pass bevi tween the door andbafile', removable filling pieces partly'closing said ports, and means for settingthe valves so as to allow air to between the ;.sill and the flare j andthe air meansrfor setting the valves so, asto allow air to pass to theair casing and through said I sports and to the space between the sill and JO N Rem.

space within-"the air casing, a rectangular fire door closingjthe front ofthe fuelpas sage casing, airports in the fuelpassage easing through which air can pass, and

I Signed at London, England, this 12th fdayjofMay, 1921. 

